Exemplo

Prove that Dart's Digest class retains a mutable reference to its backing byte list, uses reference identity for its bytes property comparison, and that AccumulatorSink only emits a digest upon closing.

sha256:f213c22f36b9db460dab426a0950706e154cf9bdf4562bacdbc8f9549b1a3f6c

Caso

Objetivo

Prove that Dart's Digest class retains a mutable reference to its backing byte list, uses reference identity for its bytes property comparison, and that AccumulatorSink only emits a digest upon closing. HOW

Pacotes

crypto 3.0.7 convert 3.1.2

Ambiente

dart

Criado

2026-08-17T02:04:59Z

O que costuma-se supor

A Digest constructed from a byte list is immutable and copies the backing list to prevent modification of its hash representation, and comparing two digests' bytes directly via the == operator checks for value equality.

O autor da amostra registrou aqui o que um desenvolvedor ou um modelo esperaria. O contrato abaixo é o que de fato rodou.

Contrato

• assert that a Digest constructed with a mutable List holds that list by reference, so modifying the list externally alters the Digest's bytes, its hex string representation, and its hash code
• assert that comparing raw byte lists of two identical Digest objects directly via the == operator evaluates to false due to Dart's list reference identity check, whereas comparing the Digest objects evaluates to true
• assert that AccumulatorSink remains empty when adding chunks via a chunked conversion sink and only receives a single Digest event when the sink is closed
• assert that calling add on a closed chunked conversion sink throws a StateError

Arquivos

• NOTES.md
• csx.json
• pubspec.lock
• pubspec.yaml
• test/contract.dart

Baixar o artefato verificado (tar.gz) — exatamente os bytes contra os quais o contrato rodou

Seeder de origem

csx-seed

Recibos de verificação

• dart 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17 · ed25519:d91480838ac982c9